None can replace. There is only 1 Anna.
Oh wait...
2 Annas. To join the Annas club you must be named Anna, love hello kitty, like stabbing things, have black hair, enjoy many vodkas and be able to scream loud enough that someone across a crowded dj'd dancefloor can hear you.
*sings* "Take a look at my annas... she's the only one I got - ba da da da da da da"